A Simple Method of Evaluating the Thermal Properties of Metallurgical Cokes under High Temperature

The reactivity index of weight loss (RI) and tumbling strength after the reaction (I₁₀⁶⁰⁰) of manufacturing coke were first tested at a temperature series of 1100, 1200, and 1300 °C under CO₂ atmosphere with different compositions and duration times to study the effects of temperature, time, and gas composition on coke hot strength. Then the RI/I₁₀⁶⁰⁰, carbon structure, and optical texture of the cokes prepared from different single coals were mainly studied after a solution reaction with CO₂ under a high temperature of 1300 °C and a standard temperature of 1100 °C. It was found that temperature greatly affects the RI/I₁₀⁶⁰⁰ of coke, especially at high temperatures up to 1300 °C. Compared with standard tests under 1100 °C, the changes of RI/I₁₀⁶⁰⁰ for different cokes are very different at 1300 °C, and the changes are greatly related to coke optical texture. Under a high temperature in the testing method, the tumbling strength of cokes with more isotropy increased, whereas it decreased for those with less isotropy. This simple method of using high temperature could yield the same results when compared with complicated simulated blast furnace conditions.